Fabric Construction Specifically For Damper

ABSTRACT

The present invention provides a fabric structure specifically for dampers. Its major feature is to weave metal yarns with non-metal yarns into a fabric body, which, after proper production steps, is then molded into dampers. Such a damper structure incorporating metal yarns may greatly enhance the mechanical properties of dampers, as well as improve the manufacturing yield and tear-resistance performance of the product. The metal yarns and non-metal yarns may be woven in various ways of arrangement, depending on the objective design requirement of the damper, so as to obtain the same or different strength and mechanical properties.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to loudspeakers, and moreparticularly to a fabric construction for dampers of loudspeakers.

2. The Prior Arts

FIG. 1 depicts a typical moving-coil loudspeaker construction whichcomprises a driving system, a diaphragm, and a suspension system. Thedriving system further includes a permanent magnet A, an upper polepiece B, a gap C and a voice coil D. Aforementioned diaphragm E is avibrating lamina for moving air, normally shaped like a cone or domebasket. The suspension system includes a damper F and a lateralsuspension construction, and is responsible for the traction ofdirectional movement of diaphragm E.

The driving mechanism of aforementioned loudspeaker is as below. Whenthe electric current flows through the voice coil D, an electromagneticfield is induced. The electromagnetic field is at right angle with themagnetic field of the permanent magnet A of the speaker such that thevoice coil D experiences forces and thus moves within gap C (the gapbetween the voice coil D and the magnet A). The mechanic force of themovement causes the diaphragm E attached to the voice coil D to move(vibrate) perpendicularly upward and downward, which in turn vibratesthe air and produces acoustic frequency to human ears. In this way,sound is reproduced for hearing.

Though other types of loudspeakers may be structured differently, theyhave the same driving mechanism, and include at least dampers forsuspending diaphragms and voice coils.

Please refer to FIG. 2 for illustration. Because dampers are mainly usedfor suspending voice coils and diaphragms, they are generally structuredwith a plurality of alternating concentric peaks and valleys. That is,their cross section exhibits a wave contour, which enables the dampersto act like shock-absorbent springs while suspending voice coils anddiaphragms at the same time. Hence, the elasticity and strength ofdampers may directly influence the amplitude of diaphragm vibration, andaccordingly influence the acoustic effect.

Conventional dampers utilize a fabric body woven with non-metal yarns(such as nylon, silk, etc.) The fabric body is resinated, dried, andthen integrally molded into dampers. Accordingly, dampers manufacturedin this way have lower strength and low tear-resistance performance,which renders the dampers susceptible to be deformed and consequentlyinfluences the acoustic output quality of speakers. In another aspect,the structure of conventional damper fabric makes it difficult toimprove the stretch and water-proof performance of dampers. Also, heatgenerated after prolonged operation of the speaker can not be conductedand dissipated rapidly as well.

SUMMARY OF THE INVENTION

To improve such mechanical disadvantages as low strength, lowtear-resistant performance, low heat conduction, low stretch andwaterproof performance of dampers manufactured with fabric wovenexclusively with non-metal yarns, a fabric structure which obviatesaforementioned disadvantages without sacrificing the elasticity requiredfor dampers is provided herein.

The main feature of the present invention is to add metal yarns properlyinto the fabric for manufacturing dampers in a way such that said metalyarns are incorporated as part of the fabric body, so that when thefabric is molded into dampers, the metal yarns may enhance the variousmechanical properties of dampers.

The major technical means of the present invention is to weave non-metalyarns with metal yarn into a fabric body. The woven fabric is processedfurther and then molded into a desired damper form.

A further technical means of the present invention is to arrange themetal yarns woven into the fabric body in a grid, with a plurality ofnon-metal yarns positioned between two metal yarns and parallel thereto.

A still further technical means of the present invention is to arrangemetal yarns woven in a non-metal yarns fabric body radially such thatwhen the damper is molded, said metal yarns may radiate from the centerof the damper.

An even further technical means of the present invention is to arrangenon-metal yarns woven in the fabric body in a grid, with metal yarnsinterlacing with said non-metal yarns non-perpendicularly.

In sum, the present invention provides a fabric structure specificallyfor dampers. Its major feature is to weave metal yarns with non-metalyarns into a fabric body, which, after proper production steps, is thenmolded into dampers. Such a damper structure incorporating metal yarnsmay greatly enhance many mechanical properties of dampers, as well asimprove the manufacturing yield and tear-resistance performance of theproduct. Said metal yarns and non-metal yarns may be woven with variousways of arrangement, depending on the objective design requirement ofthe damper, to obtain the same or different strength and mechanicalproperties.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be apparent to those skilled in the art byreading the following detailed description with reference to theattached drawings, in which:

FIG. 1 is a sectional plan view of a conventional moving-coilloudspeaker construction;

FIG. 2 is a perspective cutaway view of a damper construction inaccordance with the present invention;

FIG. 3 is a schematic plan view of a fabric body in accordance with afirst embodiment of the present invention, wherein metal yarns arearranged in a grid, with a number of non-metal yarns positioned betweentwo metal yarns and parallel thereto;

FIG. 4 is a schematic plan view of a fabric body in accordance with asecond embodiment of the present invention, wherein metal yarns arewoven radially into a non-metal yarn fabric body;

FIG. 5 is a schematic plan view of a fabric body in accordance with athird embodiment of the present invention, wherein non-metal yarns arearranged in a grid, with metal yarns arranged diagonally and interlacingwith said non-metal yarns;

FIG. 6 is a schematic plan view of a fabric body in accordance with afourth embodiment of the present invention, wherein non-metal yarns arearranged in a grid, with metal yarns intersecting each other andinterlacing with said non-metal yarns non-perpendicularly; and

FIG. 7 is a perspective view of a damper molded with the fabric bodyillustrated in FIG. 4.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 3 depicts a fabric body 1 manufactured specifically for loudspeakerdampers in accordance with a first embodiment of the present invention.The fabric body 1 may be woven with any applicable non-metal yarns, andis manufactured into a damper F as illustrated in FIG. 2 through suchproduction steps as resination, drying, press-molding and trimming. Thefabric body 1 in accordance with the present invention has a structuresimilar to that of a common fabric, and allows patterns or designs to beformed thereon.

FIG. 3 also illustrates the structure of the fabric body in accordancewith the present invention, wherein metal yarns 10 are interwoven withnon-metal yarns 11. The number of the non-metal yarns 11 is greater thanthe number of metal yarns 10 so as to retain proper softness andelasticity required for dampers. If the number of metal yarns 10 isgreater than the number of non-metal yarns 11, the damper manufacturedaccordingly may be too stiff. In the embodiment illustrated in FIG. 3,the metal yarns 10 are arranged in a grid, with a number of non-metalyarns 11 positioned between two metal yarns 10 and parallel thereto.

FIG. 4 illustrates the fabric body 1 according to a second embodiment ofthe present invention, wherein metal yarns 10 are interwoven withnon-metal yarns 11 in a way so that the metal yarns 10 are arrangedradially in the non-metal yarn fabric. Such a structure allows damper Fto be molded with metal yarns 10 radiating from the center thereof asillustrated in FIG. 7, which enhances not only the strength but also theexquisiteness of the damper.

FIG. 5 illustrates the fabric body according to a third embodiment ofthe present invention, wherein metal yarns 10 are interwoven withnon-metal yarns 11 in a way so that non-metal yarns 11 are arranged in agrid, whereas metal yarns 10 are arranged unidirectionally anddiagonally, and interlace with said non-metal yarns 11.

FIG. 6 illustrates the fabric body according to a fourth embodiment ofthe present invention, wherein metal yarns 10 are interwoven withnon-metal yarns 11 in a way so that non-metal yarns 11 are arranged in agrid, whereas metal yarns 10 are arranged diagonally in two directionsand interlace with the non-metal yarns 11.

The aforementioned fabric structure incorporating both metal-yarns andnon-metal yarns in accordance with the present invention has thefollowing advantages.

Firstly, it may enhance the strength of dampers and thus prevents thedamper from being deformed by great force and consequently influencingsound quality when the speaker is energized with great power.

Secondly, it may enhance the anti-fatigue performance of dampers andlengthens the operation life accordingly.

Thirdly, interweaving non-metal yarns with metal-yarns may enhancedamper strength without sacrificing the softness and elasticity requiredfor dampers.

Additionally, interweaving non-metal yarns with metal yarns may enhancethe stretch and waterproof performance of dampers.

Furthermore, interweaving non-metal yarns with metal yarns may enhancethe heat-dissipating efficiency of dampers, so that the heat producedduring speaker operation may be dissipated rapidly.

Although the present invention has been described with reference to thepreferred embodiments thereof, it is apparent to those skilled in theart that a variety of modifications and changes may be made withoutdeparting from the scope of the present invention which is intended tobe defined by the appended claims.

1. A fabric structure specifically for dampers, comprising a pluralityof metal yarns and a plurality of non-metal yarns, wherein said metalyarns are interwoven with said non-metal yarns into a fabric body. 2.The fabric structure specifically for dampers as claimed in claim 1,wherein the number of said non-metal yarns is greater than the number ofsaid metal-yarns in said fabric body.
 3. The fabric structurespecifically for dampers as claimed in claim 1, wherein said metal yarnsare arranged in a grid, and an appropriate number of said non-metalyarns are positioned between two of said metal yarns and parallelthereto.
 4. The fabric structure specifically for dampers as claimed inclaim 1, wherein said metal yarns are woven radially into said non-metalyarns.
 5. The fabric structure specifically for dampers as claimed inclaim 4, wherein dampers manufactured with said fabric body having saidmetal yarns radiate from the center of the damper.
 6. The fabricstructure specifically for dampers as claimed in claim 1, wherein saidnon-metal yarns are arranged in a grid, while said metal yarns interlacewith said non-metal yarns diagonally.